Even though nitrogen constitutes 78% of Earth's atmosphere, the amount available for living things nearly all comes from
A. a few genera of detritivores.
B. the breakdown of minerals.
C. nitrogen-containing fertilizers.
D. a few groups of nitrogen-fixing bacteria.
E. the breakdown of dead plants.
Answer: D
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Which of the following terms includes all of the others?
A) species diversity B) biodiversity C) genetic diversity D) ecosystem diversity E) species richness
Spontaneous mutations that occur in somatic cells will be transmitted to offspring
A. true B. false
Mendel's law of segregation implies that the two members of an allele pair
a) are assorted dependently. b) must always code for the identical trait or feature. c) are segregated pairwise. d) are distributed to the same gamete. e) are distributed to separate gametes.
Which of the following fungal infections was extremely rare prior to the AIDS epidemic?
A) pulmonary cryptococcosis B) cutaneous candidiasis C) hypersensitivity aspergillosis D) mycetomas E) Pneumocystis pneumonia